TITLE:   GCN CIRCULAR
NUMBER:  14712
SUBJECT: GRB 130528A: optical upper limit
DATE:    13/05/28 19:47:10 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

A. Volnova (IKI), E. Litvinenko (UBAI), I. Molotov (KIAM), A. Pozanenko 
(IKI) report on behalf of  larger GRB  follow-up collaboration:

We observed the field of  GRB 130528A (D'Elia et al., GCN  14711) with 
0.4-m telescope of ISON-Kitab observatory  starting on  May 28 (UT) 
17:01:13, i.e. 20 minutes after burst trigger.  We took  several 
unfiltered images of 30 s exposure. In the first image we do not detect 
any source in XRT error circle (D'Elia et al., GCN  14711). A photometry 
   is based  on nearby USNO-B1.0 stars:

T_start,     T0+,      Exposure,  OT,    UL (3sigma)
(UT)         mid, d    (s)

17:01:13    0.01395    1x30       n/d    17.3


A finding chart can be found at 
http://grb.rssi.ru/GRB130528A/GRB130528A_Kitab_fc.png